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Application of a new feature extraction and optimization method to surface defect recognition of cold rolled strips

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Journal of University of Science and Technology Beijing 2007年第5期14卷 437-442页

作者： Guifang Wu ke xu Jinwu xu National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China Electronic Information Engineering College Henan University of Science and Technology Luoyang 471003 China

Considering that the surface defects of cold rolled strips are hard to be recognized by human eyes under high-speed circumstances, an automatic recognition technique was discussed. Spectrum images of defects can be got by fast Fourier transform （FFF） and sum of valid pixels （SVP）, and its optimized center region, which concentrates nearly all energies, are extracted as an original feature set. Using genetic algorithm to optimize the feature set, an optimized feature set with 51 features can be achieved. Using the optimized feature set as an input vector of neural networks, the recognition effects of LVQ neural networks have been studied. Experiment results show that the new method can get a higher classification rate and can settle the automatic recognition problem of surface defects on cold rolled strips ideally.

关键词： cold rolled strip surface defect neural networks fast Fourier transform (FFT) feature extraction and optimization genetic algorithm feature set

The role of regulators of RNA m6A methylation in lung cancer

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Genes & Diseases 2023年第2期10卷 495-504页

作者： Qicheng Zhang ke xu Tianjin key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment Tianjin Lung Cancer InstituteTianjin Medical University General HospitalTianjin 300052China

N6 -methyladenosine (m6 A) modification is found the most prevalent and abundant post-transcriptional mRNA modification in eukaryotic cells. It regulates almost all stages of RNA life cycle including splicing, translocation, stability, decay and translation. As a dynamic and reversible process, m6 A modification is catalyzed by the RNA methyltransferases (‘writers’), removed by the demethylases (‘erasers’), and interacts with m6 A-binding proteins (‘readers’). Recent studies have revealed that these m6 A modification regulators are frequently expressed aberrantly in various types of cancer, and involved in cell proliferation, differentiation, metabolism, particularly, in tumorigenesis and tumor progression through diverse mechanisms. In this review, the m6 A modification process and its regulatory functions in lung cancer are summarized. Furthermore, the research progress in the inhibitor development of m6 A modification, and the potential of targeting m6 A modifying proteins for clinical application are discussed.

关键词： Eraser Lung cancer N6-methyladenosine Reader Writer

Mapping super-resolution image quality

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Light(Science & Applications) 2024年第2期13卷 178-180页

作者： Megan A.Steves ke xu Department of Chemistry University of CaliforniaBerkeleyCA94720USA

The local quality of super-resolution microscopy images can be assessed and mapped by rolling Fourier ring correlation,even when image quality varies within a single image.

关键词： image resolution Mapping

A risk assessment method considering risk attributes and work safety informational needs and its application

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Chinese Journal of Chemical Engineering 2024年第4期68卷 253-262页

作者： Cong Luo Yunsheng Zhao ke xu School of Political Science and Public Administration Shandong UniversityQingdao 266200China Faculty of Engineering China University of GeosciencesWuhan 430074China Department of Emergency Management of Hubei Province Wuhan 430064China

The technological revolution has spawned a new generation of industrial systems,but it has also put forward higher requirements for safety management accuracy,timeliness,and *** assessment needs to evolve to address the existing and future challenges by considering the new demands and advancements in safety *** study aims to propose a systematic and comprehensive risk assessment method to meet the needs of process system safety *** methodology first incorporates possibility,severity,and dynamicity(PSD)to structure the“51X”evaluation indicator system,including the inherent,management,and disturbance risk ***,the four-tier(risk point-unit-enterprise-region)risk assessment(RA)mathematical model has been established to consider supervision *** in conclusion,the application of the PSD-RA method in ammonia refrigeration workshop cases and safety risk monitoring systems is presented to illustrate the feasibility and effectiveness of the proposed PSD-RA method in safety *** findings show that the PSD-RA method can be well integrated with the needs of safety work informatization,which is also helpful for implementing the enterprise's safety work responsibility and the government's safety supervision responsibility.

关键词： Risk assessment Safey “51X”evaluation indicator system Four-tier risk assessment model Risk attributes Process system

Effective rare earth extraction from Nd-Fe-B waste by liquid cuprum extraction method

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Journal of Rare Earths 2020年第12期38卷 1337-1343页

作者： ke xu Junru Xiao Zhongwu Liu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Dongguan Hyper Tech Co. Ltd.Dongguan 523808China

Recovery of rare earth(RE)elements from Nd-Fe-B waste is one of the ways to solve the problem of socalled RE-crisis,An alternative approach of extracting RE elements from Nd-Fe-B waste by molten Cu extraction based on liquid-solid diffusion and reaction is reported in this *** extraction process,product microstructure and extraction efficiency were systematically *** results show that the extraction rate of RE at 1200℃is about 20%higher than that at 1100℃.The enhanced extraction efficiency at 1200℃results from the fact that the liquid Fe and Fe2 B are not co-soluble with Cu,Reducing the mass ratio of Cu to waste and the size of the waste scraps is also beneficial to enhancing the separation of RE and Fe *** addition,the extraction time should be well controlled,for example,less than 2 h at 1100℃,in order to avoid the increased Fe content in the extracted *** on optimized process,the RE elements ca n be almost fully extracted from the *** work thus provides an effective method to recover the RE elements.

关键词： Nd-Fe-B waste Rare earth extraction Liquid extraction Scrap particles Extraction efficiency

Skeletal interoception in osteoarthritis

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Bone Research 2024年第2期12卷 241-254页

作者： Dinglong Yang Jiawen xu ke xu Peng xu Department of Joint Surgery Honghui HospitalXi’an Jiaotong UniversityXi’an 710054China Department of Orthopedic Surgery and Orthopedic Research Institute West China HospitalSichuan UniversityChengdu 610041China

The interoception maintains proper physiological conditions and metabolic homeostasis by releasing regulatory signals after perceving changes in the internal state of the *** its various forms,skeletal interoception specifically regulates the metabolic homeostasis of ***(OA)is a complex joint disorder involving cartilage,subchondral bone,and *** subchondral bone undergoes continuous remodeling to adapt to dynamic joint *** findings highlight that skeletal interoception mediated by aberrant mechanical loads contributes to pathological remodeling of the subchondral bone,resulting in subchondral bone sclerosis in *** skeletal interoception is also a potential mechanism for chronic synovial inflammation in *** this review,we offer a general overview of interoception,specifically skeletal interoception,subchondral bone microenviroment and the aberrant subchondral *** also discuss the role of skeletal interoception in abnormal subchondral bone remodeling and synovial inflammation in OA,as well as the potential prospects and challenges in exploring novel OA therapies that target skeletal interoception.

关键词： homeostasis inflammation releasing

A general law of human mobility

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Science China(Information Sciences) 2015年第10期58卷 24-37页

作者： LIANG Xiao ZHAO JiChang xu ke key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences School of Economics and Management Beihang University State key Laboratory of Software Development Environment Beihang University

The intrinsic factors that drive human mobility have remained unclear for decades. Our observations from both intra-urban and inter-urban trips demonstrate a general law of human mobility. Specifically, the probability that a trip will occur is inversely proportional to the size of population located inside a circle with radius equal to the travel distance centered at the trip origin. A simple parameterless rank-based model is presented; this model can predict human flows with a convincing fidelity. Moreover, existing models can be implemented as special cases of our model, suggesting that our model is stable at more spatial scales. Our model also creates a fundamental bridge between individual mobility and social relationships.

关键词： human mobility social mobility general law rank-based model flux prediction

Three-dimensional tracking of GLUT4 vesicles in TIRF microscopy

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 232-240页

作者： Xiang-ping WU Jie-yue LI Ying-ke xu ke-di xu Xiao-xiang ZHENG Department of Biomedical Engmeermg Zhejiang University Hangzhou 310027 China College of Information Engineering China Jiliang University Hangzhou 310018 China

TIRF microscopy has provided a means to view mobile granules within 100 nm in size in two *** quantitative analysis of the position and motion of those granules requires an appropriate tracking *** this paper,we present a new tracking algorithm combined with the unique features of *** a fluorescence correction procedure was processed to solve the problem of fluorescence bleaching over *** granules were then segmented from a time-lapse image stack by an adaptive background subtraction *** filter was introduced to estimate and track the granules that allowed reducing searching range and hence greater reliability in tracking *** the tracked granules were located in x-y plane,the z-position was indirectly inferred from the changes in their *** the experiments the algorithm was applied in tracking GLUT4 vesicles in living adipose *** results indicate that the algorithm has achieved robust estimation and tracking of the vesicles in three dimensions.

关键词： GLUT4 Total internal reflection fluorescence (TIRF) microscopy Adaptive background subtraction Kalman filter Fluorescence correction

Surface Detection of Continuous Casting Slabs Based on Curvelet Transform and kernel Locality Preserving Projections

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Journal of Iron and Steel Research International 2013年第5期20卷 80-86页

作者： AI Yong-hao xu ke National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing

Longitudinal cracks are common defects of continuous casting slabs and may lead to serious quality accidents. Image capturing and recognition of hot slabs is an effective way for on-line detection of cracks, and recognition of cracks is essential because the surface of hot slabs is very complicated. In order to detect the surface longitudinal cracks of the slabs, a new feature extraction method based on Curvelet transform and kernel locality preserving projections （KLPP） is proposed. First, sample images are decomposed into three levels by Curvelet transform. Second, Fourier transform is applied to all sub-band images and the Fourier amplitude spectrum of each sub-band is computed to get features with translational invariance. Third, five kinds of statistical features of the Fourier amplitude spectrum are computed and combined in different forms. Then, KLPP is employed for dimensionality reduction of the obtained 62 types of high-dimensional combined features. Finally, a support vector machine （SVM） is used for sample set classification. Experiments with samples from a real production line of continuous casting slabs show that the algorithm is effective to detect longitudinal cracks, and the classification rate is 91.89%.

关键词： surface detection continuous casting slab Curvelet transform feature extraction kernel locality preserving projections